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By 2050 it's predicted there will be over 9 billion people on the earth. Reports have also said that there could be no fish left in the oceans by that year.

Richard Black combines these two issues and looks at how we plan to deal with the huge food shortages and over-fishing through large-scale global aquaculture, the fastest-growing form of food production on earth.

Richard explores some of the biggest advances in fish farming and looks at its likely future.